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CVE-2026-73490— Loofah: SVG `href` attribute bypasses local-reference restriction

Quick assessment

Affected
flavorjones loofah
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mike Dalessio Loofah是Mike Dalessio个人开发者开源的一款HTML文档处理组件。 flavorjones loofah 2.25.2之前版本存在跨站脚本漏洞，该漏洞源于HTML5清理器仅对SVG use和feImage元素上的xlink:href属性应用本地引用限制，而浏览器也接受普通href属性，导致精心构造的SVG可引用外部文档，容易受到跨站脚本攻击。

CVSS 4.7 · Medium EPSS 0.30% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
flavorjones loofah < 2.25.2 affected
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I. Basic Information for CVE-2026-73490

Vulnerability Information
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Vulnerability Title
Loofah: SVG `href` attribute bypasses local-reference restriction
Source: CVE Program / CVE List V5
Vulnerability Description
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.2, Loofah's HTML5 sanitizer applies its local-reference restriction only to the xlink:href attribute on SVG use and feImage elements, while browsers also accept the plain href attribute. A crafted sanitized SVG can therefore reference an arbitrary same-origin external document; use may render external SVG content containing scripts or other dangerous content, and feImage may load external images for tracking. Applications that sanitize user-supplied SVG with Loofah's default allowlist are affected. This issue is fixed in version 2.25.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
flavorjones loofah 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mike Dalessio Loofah是Mike Dalessio个人开发者开源的一款HTML文档处理组件。 flavorjones loofah 2.25.2之前版本存在跨站脚本漏洞，该漏洞源于HTML5清理器仅对SVG use和feImage元素上的xlink:href属性应用本地引用限制，而浏览器也接受普通href属性，导致精心构造的SVG可引用外部文档，容易受到跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
flavorjones loofah < 2.25.2 -

II. Public POCs for CVE-2026-73490

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III. Intelligence Information for CVE-2026-73490

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Patches & Fixes for CVE-2026-73490 (2)

Vendor Advisories for CVE-2026-73490 (1)

Vendor Pages for CVE-2026-73490 (1)

Same Patch Batch · flavorjones · 2026-08-12 · 3 CVEs total

CVE-2026-73491 2.3 LOW Loofah `allowed_uri?` does not detect `javascript:` URIs split by named whitespace charact
CVE-2026-73492 2.3 LOW Loofah `allowed_uri?` does not detect `javascript:` URIs split by numeric character refere

IV. Related Vulnerabilities

Same product: loofah
Same vendor: flavorjones
Same weakness: CWE-79

V. Comments for CVE-2026-73490

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